linux-kernel - [PATCH] amdgpu: assign adev after null check

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Message-Id: <1644890361-65071-1-git-send-email-wangqing@vivo.com>
Date:   Mon, 14 Feb 2022 17:59:21 -0800
From:   Qing Wang <wangqing@...o.com>
To:     Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:     Wang Qing <wangqing@...o.com>
Subject: [PATCH] amdgpu: assign adev after null check

From: Wang Qing <wangqing@...o.com>

adev should be assigned after a null check

Signed-off-by: Wang Qing <wangqing@...o.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
index 2c929fa..da114f7
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
@@ -259,12 +259,13 @@ static void amdgpu_ctx_fini_entity(struct amdgpu_ctx_entity *entity)
 static int amdgpu_ctx_get_stable_pstate(struct amdgpu_ctx *ctx,
 					u32 *stable_pstate)
 {
-	struct amdgpu_device *adev = ctx->adev;
+	struct amdgpu_device *adev;
 	enum amd_dpm_forced_level current_level;
 
 	if (!ctx)
 		return -EINVAL;
 
+	adev = ctx->adev;
 	current_level = amdgpu_dpm_get_performance_level(adev);
 
 	switch (current_level) {
@@ -290,13 +291,14 @@ static int amdgpu_ctx_get_stable_pstate(struct amdgpu_ctx *ctx,
 static int amdgpu_ctx_set_stable_pstate(struct amdgpu_ctx *ctx,
 					u32 stable_pstate)
 {
-	struct amdgpu_device *adev = ctx->adev;
+	struct amdgpu_device *adev;
 	enum amd_dpm_forced_level level;
 	int r;
 
 	if (!ctx)
 		return -EINVAL;
 
+	adev = ctx->adev;
 	mutex_lock(&adev->pm.stable_pstate_ctx_lock);
 	if (adev->pm.stable_pstate_ctx && adev->pm.stable_pstate_ctx != ctx) {
 		r = -EBUSY;
-- 
2.7.4